Fill in the blanks using the words given in the box.
(a) A chemical process in which a substance reacts with oxygen to give off heat is called ___
(b) Wood, paper, CNG are ___
(c) The lowest temperature at which a substance catches fire is called its ___
(d) Ignition temperature of ___
is lower than that of wood.
(e) The substances which have very low ___
temperature and can easily catch fire with a flame are called ___
(f) The amount of heat energy produced on complete combustion of 1kg of a fuel is called its ___.